feat: add documentation for deprecation and removal of Questionnaire API endpoints

Author: Maffooch

docs/content/releases/os_upgrading/2.56.md

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+---
+title: 'Upgrading to DefectDojo Version 2.56.x'
+toc_hide: true
+weight: -20260215
+description: Deprecation of Questionnaire API Endpoints
+---
+
+## Deprecation: Questionnaire API Endpoints
+
+The following Questionnaire API endpoints are being deprecated and will be removed in DefectDojo 2.59.0 on June 2nd, 2026:
+
+- `/api/v2/questionnaire_answered_questionnaires/`
+- `/api/v2/questionnaire_answers/`
+- `/api/v2/questionnaire_engagement_questionnaires/`
+- `/api/v2/questionnaire_general_questionnaires/`
+- `/api/v2/questionnaire_questions`
+
+### Required Actions
+
+Support for these endpoints will be fully removed in DefectDojo 2.59.0 (scheduled for June 2nd, 2026). After this date, any requests to these endpoints will return a 404 Not Found error.
+
+### Timeline
+
+- **DefectDojo 2.56.x onwards**: Endpoints are deprecated with deprecation headers
+- **DefectDojo 2.59.0 (June 2nd, 2026)**: Endpoints will be removed entirely
+
+For more information, check the [Release Notes](https://github.com/DefectDojo/django-DefectDojo/releases/tag/2.56.0).

docs/content/releases/os_upgrading/2.59.md

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+---
+title: 'Upgrading to DefectDojo Version 2.59.x'
+toc_hide: true
+weight: -20260602
+description: Removal of Questionnaire API Endpoints
+---
+
+## Removal: Questionnaire API Endpoints
+
+As announced in DefectDojo 2.56.0, the following Questionnaire API endpoints have been removed:
+
+- `/api/v2/questionnaire_answered_questionnaires/`
+- `/api/v2/questionnaire_answers/`
+- `/api/v2/questionnaire_engagement_questionnaires/`
+- `/api/v2/questionnaire_general_questionnaires/`
+- `/api/v2/questionnaire_questions`
+
+### Required Actions
+
+Any requests to these endpoints will now return a 404 Not Found error.
+
+For more information, check the [Release Notes](https://github.com/DefectDojo/django-DefectDojo/releases/tag/2.59.0).